PERMEABILITY OF FRACTURED RESERVOIRS IN THE JINGBEI BURIED-HILL POOL, CENTRAL LIAONING PROVINCE：A RENORMALIZATION GROUP APPROACH

The renormalization group method coupled on the percolation theory provides an effective way to calculate fracture connectivity and to describe the scale dependence of rock permeability. An example is taken from the fractured reservoirs of sandstone and dolomite in the Jingbei buried-hill pool within central Liaoning province, Northeast China. In the　cores of A67 well, total fracture probabilities calculated within the core scale may be larger than 0.5 or the　critical probability for 2D-fracture network. This indicates the utmost connection of fracture networks in reservoirs, thus corresponding to the abundance of pores in sandstones. On the other hand, these fractured reservoirs are overprinted by numerous faults in the pool. Whether conductive or not, small faults referred to as those under the resolution, will undoubtfully have an impact on the reservoir permeability. Modified renormalization group method is herein used. If small faults are inconductive,calculated permeabilities decrease from 22mD in fractured matrix to several mD within the scale of well spacing; and if conductive, increase with the observation scale.